1) Can you measure a 5V 50uS repetitive pulse on the 16 digital inputs ?
2) Can you measure a 32MHz square wave on the 16 digital inputs ?
3) Are the 16 digital inputs and measurements accessible via the SDK API for C# ?

I'm wondering whether I need a 4 input + 16 or whether I will need extra switches to route signals to the 4 analogue inputs.